CVE-2021-34913
Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.
NVD · uneditedThis vulnerability allows remote attackers to execute arbitrary code on affected installations of Bentley View 10.15.0.75. User interaction is required to exploit this vulnerability in that the target must visit a malicious page or open a malicious file. The specific flaw exists within the parsing of JT files. Crafted data in a JT file can trigger a read past the end of an allocated buffer. An attacker can leverage this vulnerability to execute code in the context of the current process. Was ZDI-CAN-14831.
Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.
dbcve analysis · high confidenceA buffer over-read vulnerability exists in Bentley View's JT file parser. When parsing specially crafted JT files, the parser reads data past the end of an allocated buffer, which can be leveraged by an attacker to achieve arbitrary code execution in the context of the current user process.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.
NVD · CPE data< 10.16.02< 10.16.02CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.
From the vector- Attack vector
- Local
- Complexity
- Low
- Privileges
- None
- User interaction
- Required
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.
dbcve checksWork through these to decide whether this CVE applies to you.
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Identify installed Bentley productOpen Bentley View or Microstation and navigate to Help > About, or check your installed programs list in Windows Control Panel to confirm either Bentley View or Microstation is installedAffected if Bentley View or Microstation is present on the system
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Determine installed version numberIn the application, go to Help > About and note the full version number displayed (for example, it may show something like 10.16.01.00 or earlier)Affected if The version shown is less than 10.16.02
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Compare version to affected rangeReview the version number obtained from the About dialog and compare it against the affected range: any version below 10.16.02 is vulnerableAffected if Installed version is 10.16.01.x or earlier, or any version shown as below 10.16.02
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Confirm JT file processing is in useCheck if the system is used to open, view, or process JT files, either through the application directly or through any integrated workflowsAffected if The affected application is present AND JT files are processed or can be opened
You are affected if Bentley View or Microstation is installed with a version number lower than 10.16.02 and the application is used to open JT files.
Generated from the published advisory. Verify against your own configuration.
Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.
dbcve · scoped10.16.02
Avoid opening untrusted or unverified JT files in Bentley View. Apply vendor patches when available. Consider using application sandboxing or restricted environments when processing external JT files.
10.16.02
- Upgrade Bentley View to version 10.16.02 or later
- Upgrade Microstation to version 10.16.02 or later
- After upgrading, avoid opening untrusted JT files from unknown sources as a defense-in-depth measure
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation4.0 h
- Implementation8.0 h
- Testing6.0 h
- Review / QA4.0 h
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Free · runs locallyCheck whether your project pulls in CVE-2021-34913 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2021-34913 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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- Verified mitigations, workarounds, and config changes
- Version or environment caveats, and links to real fixes
- No weaponised exploit code, or anything meant to cause harm
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